Komatsu DNH020_6L_LT(S/N 60001-UP (D21PL-6))
Maintenance schedule, common problems & OEM parts breakdown
The Komatsu DNH020-6L-LT (S/N 60001-UP, D21PL-6) is a mid-size crawler bulldozer positioned within Komatsu's heavy earthmoving lineup. Operating weights for the broader DNH020 series range from approximately 13.8 to 112.62 tonnes depending on configuration, placing this specific model in the heavy-duty category for its class. The machine is part of the D21PL-6 generation, succeeding earlier D20 and D21 series predecessors. Configurations offered include standard and low-ground-pressure (LGP) variants, with the 'LT' suffix denoting a specific track and undercarriage setup for this serial range. Production years for the D21PL-6 series span the mid-to-late 2010s, bridging the gap between the D20P-6A and the newer D21P-8 generations.
Across the DNH020 series generations, key changes include the transition to Tier 4 Final/Stage V compliant engines, updated hydraulic systems for improved fuel efficiency, and enhanced operator cab ergonomics. The DNH020-6L-LT matters in the used and parts market because it represents a mature, high-demand platform where Komatsu CARE warranty periods have expired, driving demand for reliable aftermarket undercarriage, engine, and hydraulic components. Its widespread use in mining and large-scale construction ensures strong parts availability and a robust secondary market for rebuilt powertrain and undercarriage assemblies.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Komatsu DNH020_6L_LT(S/N 60001-UP (D21PL-6)) specifications
Engine
| Model | SAA6D107E-1N |
| Emissions Tier | Tier 4 Final / EU Stage V |
Weights
| Operating Weight | Varies by configuration/series |
Dimensions
| Transport Length | Varies by configuration/series |
| Transport Width | Varies by configuration/series |
| Transport Height | Varies by configuration/series |
| Track Gauge | Varies by configuration/series |
| Track Shoe Width | Varies by configuration/series |
| Ground Clearance | Varies by configuration/series |
Performance
| Travel Speed (Forward) | Varies by configuration/series |
| Travel Speed (Reverse) | Varies by configuration/series |
| Drawbar Pull | Varies by configuration/series |
| Gradeability | Varies by configuration/series |
| Ground Pressure | Varies by configuration/series |
Blades
| Blade Type | Varies by configuration/series |
| Blade Capacity | Varies by configuration/series |
Service Capacities
| Fuel Tank | Varies by configuration/series |
| Hydraulic System | Varies by configuration/series |
| Engine Oil | Varies by configuration/series |
| Cooling System | Varies by configuration/series |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
Komatsu DNH020_6L_LT(S/N 60001-UP (D21PL-6)) maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the DNH020_6L_LT(S/N 60001-UP (D21PL-6)) beyond the schedule
Predictive Maintenance & Fluid Analysis
Utilize Komatsu Oil/Fuel & Wear Analysis (KOWA) at every 500-hour interval to monitor engine wear metals (iron, copper, lead, aluminum) and contaminants (silicon for dirt, sodium for coolant). Collect hydraulic fluid samples to check ISO cleanliness, particle count, and water content. Monitor coolant pH, SCA concentration, and glycol levels to prevent corrosion and overheating. Track transmission and final drive oil viscosity and oxidation levels. Use KOMTRAX telematics to correlate fluid degradation with load frequency and operating hours, allowing for condition-based service rather than rigid schedules.
Corrective & Common Repairs
Address frequent undercarriage wear on the DNH020-6L-LT by inspecting track rollers, idlers, and sprockets for alignment and tension issues. Replace hydraulic return filters at 500-hour intervals to prevent pump contamination. Check and torque ROPS bolts and cutting edge/end bit bolts to prevent structural fatigue failures. Inspect turbocharger hoses and clamps for leaks that cause power loss. Replace worn hydraulic hoses and seals to prevent fluid leaks and environmental contamination. Monitor engine oil pressure and address any drops immediately to avoid bearing damage.
Overhaul & Rebuild Points
Plan major powertrain overhauls around the 2,000-hour mark, including hydraulic oil changes, transmission service, and coolant flushing. Inspect final drive gears and bearings for wear during the 1,000-hour service. Evaluate undercarriage components for replacement when wear measurements exceed OEM limits. Consider engine overhaul based on KOWA analysis showing excessive soot, fuel dilution, or metal wear. Inspect the DPF system for clogging and perform regeneration or cleaning as needed. Check swing machinery and travel motors for internal leakage and performance degradation.
Seasonal & Environment Servicing
In cold climates, ensure coolant concentration is adequate to prevent freezing and use appropriate viscosity engine oil and hydraulic fluid. Check battery health and charging system performance in extreme temperatures. In dusty environments, inspect and clean air filter outer elements frequently and replace inner elements as needed. Monitor radiator and oil cooler fins for debris buildup and clean regularly to maintain cooling efficiency. In wet or muddy conditions, check track tension and undercarriage for material buildup that can accelerate wear. Verify DEF system functionality and fluid levels to ensure emissions compliance.
DNH020_6L_LT(S/N 60001-UP (D21PL-6)) common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 103-60-23240 | Cartridge,Hydraulic Oil Filter | Hydraulic service | Check fitment → |
| 113-60-43320 | Cartridge,Hydraulic Oil Filter (D31s) | Hydraulic service | Check fitment → |
| 113-60-43321 | Cartridge,Hydraulic Oil Filter (D31s) | Hydraulic service | Check fitment → |
| 07002-03334 | O-Ring, At Transmission Filter | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
DNH020_6L_LT(S/N 60001-UP (D21PL-6)) fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| CA115 | Engine crankshaft speed sensor and backup speed sensor failure | Faulty speed sensor, broken wiring harness, or corroded connector at the pin interface | Inspect the sensor wiring and connectors for damage or corrosion; replace the speed sensor if voltage checks fail |
| CA111 | Internal engine controller (ECM) fault | Electronic Control Module internal failure or software corruption | Replace or reprogram the ECM; verify power and ground connections first |
| CA451 | Common rail pressure sensor feedback value too high | Malfunctioning rail pressure sensor, actual overpressure condition, or wiring issue | Diagnose the fuel rail pressure sensor circuit and check for physical blockages in pump lines |
| CA441 | Battery voltage too low | Weak battery, failing alternator, or loose/corroded connections | Check battery health and alternator output; replace the alternator or battery as needed |
| AA10NX | Air cleaner clogging | Clogged air filter element due to dust or lack of maintenance | Replace the air filter element immediately |
| B@BCNS | Engine coolant overheating | Low coolant level, blocked radiator fins, or failed fan belt | Check coolant level, inspect radiator fins for debris, and verify fan belt tension |
| CA122 | Intake air pressure sensor feedback voltage too high | Faulty intake pressure sensor or wiring short | Verify the intake pressure sensor operation and inspect the wiring harness for shorts |
| CA123 | Intake air pressure sensor feedback voltage too low | Sensor short circuit or severe airflow restriction upstream | Check for sensor shorting and inspect for airflow restrictions in the intake system |
| CA234 | Engine overspeed | Throttle calibration error, engine load cycle issue, or operator misuse | Verify throttle calibration and inspect the engine load cycle for anomalies |
| CA442 | Battery voltage too high | Failing voltage regulator or alternator overcharging | Replace the alternator or battery; check the voltage regulator function |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
DNH020_6L_LT(S/N 60001-UP (D21PL-6)) attachments & work tools
Blades
The DNH020-6L-LT (D21PL-6) configuration supports standard (S), semi-universal (SU), and all-purpose (A) blade types, with VPAT availability varying by configuration/series. Typical widths and capacities for this class range from 2.41 m to 3.05 m (7 ft 11 in to 10 ft 0 in) with bucket capacities between 1.5 m³ and 2.5 m³ (1.96 yd³ to 3.27 yd³). Factory spec sheets for the D21PL-6 series indicate these dimensions are standard for the mid-size dozer class.
Rippers
Multi-shank rippers are the primary option for the DNH020-6L-LT class, typically featuring three to five shanks for heavy-duty breaking. Single-shank options are generally not standard for this specific serial range (D21PL-6), which is engineered for multi-shank attachment points. Weights for multi-shank assemblies in this class typically range from 1,200 kg to 1,800 kg (2,646 lb to 3,968 lb) depending on shank count and construction.
Winches
Towing winch options for the DNH020-6L-LT class typically include rear-mounted winches with capacities ranging from 150 kN to 200 kN (33,722 lbf to 44,961 lbf). These winches are designed for recovery and heavy pulling tasks, compatible with the rear drawbar structure. Availability varies by configuration/series, with some forestry or waste configurations omitting the winch to prioritize guarding.
Drawbars/Counterweights
The DNH020-6L-LT (D21PL-6) utilizes a fixed rear drawbar designed for ripper or winch mounting, with counterweight options varying by configuration/series to balance blade loads. Counterweights typically add 1,500 kg to 2,500 kg (3,307 lb to 5,512 lb) to the rear structure. Factory spec sheets for the D21PL-6 series confirm the drawbar is integral to the rear frame for ripper attachment.
Cab/ROPS Guarding
Forestry and waste configurations for the DNH020-6L-LT include enhanced ROPS guarding, FOPS (Falling Object Protective Structure) certification, and side/rear mesh screens. These options are designed to meet ISO 3471 and ISO 3449 standards for operator protection in debris-heavy environments. The D21PL-6 series offers these as factory-installed or dealer-fitted options depending on the specific serial range.
Hydraulic Arrangement
The DNH020-6L-LT (D21PL-6) features a dual-pump hydraulic system with dedicated circuits for blade/rippler and auxiliary tools. Front blade hydraulics use high-flow lines for rapid cycle times, while rear ripper/winches utilize separate control valves. Factory spec sheets for the D21PL-6 series indicate the hydraulic arrangement supports simultaneous operation of blade and ripper functions.
All DNH020_6L_LT(S/N 60001-UP (D21PL-6)) assemblies by section
Every catalogued assembly group for the Komatsu DNH020_6L_LT(S/N 60001-UP (D21PL-6)). Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Guard
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Guard : Rear Cover And Hydraulic Tank (For 3-Point Hitch)(#60001-60558)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 6 |
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Guard : Rear Cover And Hydraulic Tank (For 3-Point Hitch)(#60559-)
| 01***20 | Bolt,(With Auto Emergency Steering) | 3 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 8 |
| 01***40 | Bolt,(With Service Valve R.H.) | 4 |
Work Equipment
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment : 3-Point Hitch (1/2)
| 01***45 | Bolt, Mount Center Hinge Retainer (Lower) | 4 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 6 |
| 01***40 | Bolt (Op) | 8 |
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment : 3-Point Hitch (2/2)
| 01***16 | Bolt, Mount Washer Tank To Bracket, Bolt | 2 |
| 01***25 | Bolt,Without Revolution Sensor | 6 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 4 |
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment : 3-Point Hitch Cylinder
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 2 |
| 01***32 | Washer,(With Auto Emergency Steering) | 2 |
| 07***70 | O-Ring,(For Intake Air Cover) | 1 |
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment : Swing Drawbar (For 3-Point Hitch)
| 01***35 | Bolt,R.H. Outside And L.H. Inside | 8 |
| 01***40 | Bolt,R.H. Outside And L.H. Inside, Bolt | 4 |
| 01***42 | Washer,Spring (For Pedal Steering), Washer-Spring | 12 |
Work Equipment Control System
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment Control System : Hydraulic Piping (Valve To Cylinder) (For 3-Point Hitch)
| 01***18 | Bolt | 1 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 1 |
| 01***20 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment Control System : Hydraulic Tank And Filter (For 3-Point Hitch)
| 01***25 | Bolt,Without Revolution Sensor | 7 |
| 01***25 | Bolt,(For Canvas Canopy?Head Guard) | 3 |
| 01***25 | Washer,Spring?For Additional Rear Lam | 7 |
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment Control System : P.T.O. Control Lever (For 3-Point Hitch)
| 01***25 | Bolt,(Sandy? Dusty Terrain Spec.) | 2 |
| 01***16 | Bolt, Battery To Frame Ground Wire Attaching | 2 |
| 01***30 | Bolt,(For Quick Shift) (Mitsubishi) | 2 |
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment Control System : Work Equipment Control Lever (1/2) (For 3-Point Hitch)
| 01***16 | Bolt (With Air Heater & Conditioner) | 2 |
| 01***20 | Bolt,(With Auto Emergency Steering) | 8 |
| 01***30 | Bolt,(For Mechanical Governor) | 1 |
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment Control System : Work Equipment Control Lever (2/2) (For 3-Point Hitch)
| 01***05 | Nut,L.H. Thread (D31s) | 1 |
| 01***05 | Nut,L.H. (For Trimming Dozer) | 1 |
| 01***06 | Nut,(With Back-Up Alarm) (Op), Nut; Was 01580-10806 | 1 |
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment Control System : Work Equipment Valve (1/2) (For 3-Point Hitch)
| 01***16 | Bolt (Op) | 4 |
| 01***25 | Bolt, Seal Cover Mounting | 4 |
| 01***30 | Bolt | 4 |
Komatsu : Dnh020_6l_lt(S/N 60001-Up (D21pl-6)) : Work Equipment Control System : Work Equipment Valve (2/2) (For 3-Point Hitch)
| 01***08 | Nut (Op) | 1 |
| 07***11 | O-Ring (Kit) | 1 |
| 07***15 | O-Ring,(Without Boom Kickout) | 1 |
Frequently asked questions
What engine does the Komatsu DNH020-6L-LT use?
The Komatsu DNH020-6L-LT (S/N 60001-UP, D21PL-6) is equipped with a Komatsu diesel engine compliant with Tier 4 Final/Stage V emissions standards. Specific engine model designation is not provided in the available source data for this exact serial range; verify with your dealer using the machine serial number.
What is the operating weight of the Komatsu DNH020-6L-LT?
Operating weight varies by configuration and series. The broader DNH020 series has an operating weight range of approximately 13.8 to 112.62 tonnes. Specific weight for the DNH020-6L-LT (D21PL-6) configuration is not explicitly stated in the source data; consult the factory spec sheet for your serial range.
What model replaced the Komatsu DNH020-6L-LT?
The DNH020-6L-LT (D21PL-6) is part of the D21 series generation. Successor models in the Komatsu bulldozer lineup include the D21P-8 and later generations. Specific replacement model for this exact serial range is not detailed in the source data; refer to Komatsu product archives for the direct successor.
What DNH020_6L_LT(S/N 60001-UP (D21PL-6)) owners discuss
What are the typical powertrain and hydraulic behaviors for the Komatsu DNH020_6L_LT(S/N 60001-UP (D21PL-6))?
What undercarriage or wear patterns are typical for this machine type?
What are the known engine quirks per the D21PL-6 series?
What are the common electrical and sensor issues?
What should be checked when buying a used DNH020_6L_LT(S/N 60001-UP (D21PL-6))?
What is the critical safety fix for track tension and undercarriage binding?
What is the critical safety fix for engine cooling system integrity?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
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